
require '/usr/local/lib/site_ruby/rgl/adjacency.rb'
require '/usr/local/lib/site_ruby/rgl/dot.rb'
dg = RGL::DirectedAdjacencyGraph[1,2, 2,3, 2,4, 4,5, 6,4, 1,6]
dg.write_to_graphic_file('jpg')

